More Disk ][ Troubles

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Joined: Jul 15 2014
Posts: 43

Neither of my Disk ][ drives will read any disks. I've had this problem before; replacement of the 74LS125 on the analog card solved it then. I tried a similar thing today, but the problem persisted.

For what it's worth, I noticed that the impedances of Drive 2's head are higher than they should be according to Sams Computerfacts.

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Joined: Feb 16 2018
Posts: 6
Re: More Disk ][ Troubles

Impedance on one drive shouldn't affect the other. Have you got a scope?

I'd start by working through this and seeing if you're getting signals off the various test points: